We just found multiple pin hole leaks in Carbon Steel tubing in our HVAC unit. The tubes carry 50# of steam (might have trace amounts of cyclohexlamine and hydrazine (.1-.2 ppm) at ~300 F. Aluminum fins are touching (not actually attached) the steel and most (if not all) of the pinholes are located beneath the aluminum fins. I'm concerned about galvanic corrosion but don't think it could be that since the Aluminum is the more active metal. Could erosion-corrosion cause these pinholes? Maybe it's just localized corrosion? Finally, could galvanic corrosion occur at this location? Any information would help! Thanks!
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